Ryan Hall holds numerous records as an Olympic marathon runner for the USA. But after getting to his lowest weight of 127lbs at 5'10", he became so injured that he had to give up running. He found himself in the weight room, and now he's 192lbs and healthier than ever. We talk with him about weight training for all endurance athletes, the best way to approach weights, the differences in how he felt then and now, and more.